简介:考虑由磁流体力学方程组控制的二维不可压缩流体的初边值问题,在边界光滑的有界区域中,当(u0,B0)∈((Wm,p(Ω))2×Wm,p(Ω))时,利用Galerkin方法和先验估计,得到了相应的初边值问题存在唯一的弱解(u(.,t),B(.,t))∈((Wm,,(Ω))×Wm,p(Ω)),并证明了弱解对初值(U0,B0)具有连续依赖性.
简介:本文提出了求解非线性方程组的一种非精确Broyden方法.该方法是文献[8]中精确Broyden方法的推广.在适当的条件下,我们证明了非精确Broyden方法具有全局收敛性和超线性收敛性.数值实验表明,该方法效果较好.
简介:Ithasbeenproposedthatfusionreactionsbetweenneutron-richlightnuclei,forexample24C,24Oand28Ne,maycontributetoachievingtheignitiontemperatureforexplosivecarbonburningprocessduringsuperbusrsts[1,2].Studiesoffusionreactionsinvolvingneutron-richnucleiarebeyondordinaryexperimentaltechniques,sincetheintensityofradioactivebeambecomelowforthesemeasurements[3].TheactivetargettechniqueusingTPC(TimeProjectionChamber),withpropertiesofmulti-sampling,highefficiencyandlowbackground,isasuitablesolutiontotheproblem.
简介:β-glucanisoneofthemostimportantsourcesofcellwallinyeaststrains(Saccharomycescerevisiae).Itisnowknownthatβ-glucannotonlyexhibitsabroadspectrumofbiologicalactivitiesincludingimmune-modulating,anti-inflammatory,anti-cancer,andanti-agingproperties,butalsocanbeusedinfoodproductionasmoisturizer,dietaryfibers(DF)[1].Therefore,itisimperativetobreedyeaststrainswithhigherbiomassproductionandoptimizethefermentationprocess.Saccharomycescerevisiaeneedscarbonsourcesinbiomassaccumulation,butglucoseisexpensiveinindustrialfermentation[2].TheaimofthisstudyistoevaluatethedifferentcarbonsourcesonthegrowthofSaccharomycescerevisiae.
简介:为提高光电平台的控制性能和稳定性,以平台反馈回路所用的光纤陀螺传感器为研究对象,对光纤陀螺角速率的历史输出、当前量测以及随机漂移进行融合补偿。采用双自回归模型确定了光纤陀螺时间序列输出的自回归多项式和光纤陀螺随机漂移的自回归关系。以陀螺当前输出为量测量,结合卡尔曼滤波算法将陀螺历史输出和历史随机漂移融合进状态方程,并进行随机漂移在线估计补偿。实验结果表明,光纤陀螺随机漂移的AR模型能达到90%拟合效果,经卡尔曼滤波补偿后随机漂移能降到1/10。该方法能很好地抑制光电平台三个框架轴光纤陀螺的随机漂移,补偿率为80%~90%。